#container{
    width: 700px;
    text-align: center;
}
#top{
    width: 700px;
    height: 300px;
    background-color: bisque;
}
#left{
    width: 300px;
    height: 600px;
    float: left;
    background-color: brown;
}
#right{
    width: 400px;
    height: 600px;
    float: left;
    background-color: darkcyan;
}